Worried mom...My lil one is 9 months old..from last 6 months i was in india with my baby n he always…

Worried mom...My lil one is 9 months old..from last 6 months i was in india with my baby n he always had a green colour poo..two days back i came from india n again he is having yellow poo from two days..n he is also not taking milk..i gave him cereals n lentil soup but thats not sufficient as he is not taking milk..please help..